use the arrow keys to move the cursor to another edge of the monitor(s) or press one of the arrow keys and then move the mouse. The Taskbar is now 'attached' to the end of the cursor, so moving the cursor near one of the monitor edges will snap the Taskbar there

You can also select 'Size' (S) instead of 'Move' to easily resize the Taskbar.

Thanks! I had trouble clicking/dragging because my bar was full of windows and I could not find a spot that would drag. I needed to resize it so that there was empty space (others might just close their windows). Then click and drag worked like a charm.
–
sageJan 20 '13 at 18:43